body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, #6e8efb, #a777e3);
    color: white;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.charts-row {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 20px;
    margin: 20px 0;
}

.chart-container {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    height: 300px;
    position: relative;
}

.pie-chart-container {
    max-width: 400px;
    margin: 0 auto;
}

/* ... 其他样式 ... */